If a person wants to stop an entire class of people from marrying though, I think that at least on some level, they must be averse to that group. Otherwise why even care.
Sure it is a reasonable rationale, but again even some gay folks think that way. Your line of thinking would also make most of the minority movements biggots themselves because the care a lot and usually are very anti the people on the majorities that their groups are considered minority (a very big portion of notorious and outspoken feminists are very misandric, a lot of black minority leaders give a lot of anti-white speach, leaders of gays right movements put a lot of attack against religion and religious group, etc). I would guess a lot of times a portion of those against gay marriage isn't because of the act in itself (which as I said others against would just be because of "santity" of marriage), but because of wrong belief against what the leadership of those movements align with so they don't want to give away an inch. And finally, someone being right wing or republican, doesn't mean it is a caricature or even oppose gay marriage. For example what do you think about demanding that churches celebrate the gay marriage?
duduspace11 "Well, since we are estimating costs, Pokemon Red/Blue did cost Nintendo about $50m to make back in 1996"
Mr Puggsly: "Hehe, I said good profit. You said big profit. Frankly, not losing money is what I meant by good. Don't get hung up on semantics"
Azzanation: "PS5 wouldn't sold out at launch without scalpers."